Past IABSE Webinars

Webinar: Ultra-High-Performance-Concrete (UHPC)

Date: 30 April (Friday), 2021, 14-15 hrs (CET, GMT +1).

Speaker: Prof. Lukas Vrablik, Czech Republic; Moderator: Prof. Roman Lenner, South Africa.

Organised by the South African Group of IABSE.

 

Recorded video: https://iabse-elearning.org/lecture-series.html

 

The topic of webinar will be practical use of Ultra-High-Performance-Concrete (UHPC) as the main material for superstructure of pedestrian bridges. Two practical examples of real pedestrian bridges will be presented – first is a segmental single span bridge (completely made by UHPC segments) and the second example is a cable stayed pedestrian bridge where the superstructure is composed of UHPC segments. Information about design (material and structural analysis, detailing and construction stages) will be described and presented.   

 

Moderator: Roman Lenner – Associate Professor at Stellenbosch University and IABSE National Chair of South Africa, Member of IABSE TG1.3 Work Group and Joint Committee for Structural Safety. Main research interests are structural reliability, bridge design and bridge traffic loading. Practical experience involves bridge design in USA and design review of tunnels in Germany along with working as a World Bank consultant for transportation projects in southern Africa.

 

Speaker: Lukas Vrablik – Associated professor CTU in Prague, Head of Department of Concrete and Masonry Structures; Technical director Valbek; Member of group for Eurocode and Model Code implementation; specialized for bridge design (long span bridges, arch bridges, pedestrian bridges), mathematical simulations of structure and material behaviour; monitoring of existing structures. Author or co-author of more than 100 publications and contributions to proceedings, 2 patents, 1 momograph.


Webinar: ​Parametric Structural Design with Isogeometric Analysis

Date: 9 April (Friday), 2021, 14-15 hrs (CET, GMT +1).

Speaker: Dr. Anna Bauer, Germany; Moderator: Prof. Jan Wium.

Organised by the South African group of IABSE.

 

Recorded video: https://iabse-elearning.org/lecture-series.html

 

Isogeometric analysis (IGA) is a fairly new approach within finite element analysis. In contrast to classical approaches that require a replacement of the CAD model by a finite element model, IGA omits this step by using the same parametric description also for the analysis. The Ansatz functions used are usually Non-uniform Rational B-Splines (NURBS). The smooth basis functions and the seamless link to CAD provides a lot of possibilities in the design of structures. This talk will give a brief overview of IGA and the respective requirements and challenges. Furthermore, the potentials of the method within the parametric design of light-weight structures, such as bending-active structures with mounting processes and form finding of tensile membrane structures, are highlighted.

 

Speaker: Dr. Anna Bauer is a structural engineer at Mayr Ludescher Partner and recently finished her Ph.D. at the Chair of Structural Analysis of Prof. Dr.-Ing. K.-U. Bletzinger at the Technical University of Munich. She is exploring and developing the novel simulation approach of isogeometric analysis with CAD-integration for the design of lightweight structures. The applications are manifold but one main focus is the construction process of bending-active structures. She received her B.Sc. (2012) and M.Sc. (2015) in Civil Engineering at the Technical University of Munich. In 2018, she was awarded the IASS Hangai Prize for her paper on sliding cables with isogeometric analysis at the annual symposium.

 

Moderator: Prof. Jan Wium, responsible for the discipline in Construction Engineering and Management, at Stellenbosch Univeristy, South Africa. His research areas encompass construction risk, design management, modular construction and the use of technology in construction. He has served as an Editorial Board Member for IABSE's journal SEI, and as a governing body member in several committees within IABSE. He completed his PhD from EPFL, Lausanne, Switzerland.

 


Risk-based asset management and the potential of UHFB in railway bridge construction from the point of view of the infrastructure operator

 

Web meeting March 4th, 2021. 16: 00-17: 00. Speaker: Dipl.-Ing. Herbert Friedl, SBB AG - infrastructure, Head of Asset Management in Civil Engineering.

 

Language: German. Organised by Austrian Group of IABSE. 

 

Recorded video: https://iabse-elearning.org/lecture-series.html

  

The Swiss Federal Railways -SBB- manage a remarkable infrastructure system with over 6,000 bridges, more than 17,000 retaining walls and over 400 tunnels. These structures alone represent a replacement value of around 30 billion Swiss francs. So far, decisions regarding building maintenance and future cost planning have mainly been used for the condition classes (grades) of the individual buildings.

 

As part of the further development of the asset management of civil engineering structures, a change from the condition-based approach to a risk-based approach is planned. Many additional parameters are taken into account. Evaluations of the probability of failure of structures, estimates of the volume of traffic on the lines and on the bridges, etc.

 

A risk-based model for railway bridges has been developed and can be used to identify top risks and differentiate at the network level. In 2017, the SBB realized a railway bridge which was built from reinforced UHFB.

 

The advantages of structures made of UHFB are lower life cycle costs and, thanks to the modular design with a high degree of prefabrication, enable shorter construction times and thus fewer operational restrictions. The bridge with a span of 6.0 m was equipped with a monitoring system in order to record the behavior of the structure as a result of train crossings. After three years of monitoring, the results confirm the correct behavior of the bridge and future structural maintenance will be carried out according to existing standards. This webinar will introduce the new risk-based approach to asset management and presents UHFB applications at SBB.

 

 
Webinar: Structural Analysis & Design Using Advanced Software: A Six-Story Building Application

February 22, 2021 Organised by the Philippine group of IABSE.

 

 
IABSE Webinar: "Incremental Launching - Multispan Steel Bridges”

 

Moderator: Rafael Martinez (Spain), Speaker: Javier Martinez (Spain).

Date: 4 February, 2021, 14-15 hrs (CET).

Recorded video: https://iabse-elearning.org/lecture-series.html

 

Description: This webinar is an initiative by IABSE Task Group 4.14 (Commission 4) on Special Heavy Lifting Equipment, Chaired by Javier Martinez. This online presentation and Q&A session will review the different technologies and specific tools developed during the last few years for incremental launching multispan bridges showing different types of soiutions, depending on the geometry of the deck, and even regions. 

 

About the Speaker: Javier Martinez, born in Madrid, Spain, graduated as Naval Architect at the Polytechnic University of Madrid, and thereafter his interest was focused in the transport and installation of oversized pieces, as in offshore as in onshore sectors. In 1983, he founded the company LASTRA in Spain. LASTRA specialized in the engineering and final installation of heavy equipment which couldn’t be installed by a crane. He was involved in the design of new tools and concepts of skidding and lifting.  Around the end of the 80’s, vital civil projects were performed in the European Community, which gave rise to the Universal Exhibition at Sevilla, and the Olympic Games in Barcelona. LASTRA designed and implemented innovative solutions, transferring such knowledge and experience to other countries. In 1991, LASTRA was sold to the Australian Industrial Group BRAMBLES and later on to UK ALE. Both companies gave the financial support needed to continue with the development and new designs. In January 2020 ALE was sold to MAMMOET where J. Martinez is the Global Commercial Director.

 

About the Moderator: Rafael Martinez was born in Madrid in 1979. He graduated as BEng in Civil Engineering by the Universidad Politecnica de Madrid in 2004. His whole career has been related to the civil engineering business, starting in with Spanish civil contractor Acciona. In 2007 he joined former ALE Lastra, guiding his professional activities to the applications of heavylifting for civil projects, and showing from the beginning a particular interest in bridge construction by heavlifting methodologies. He was Project Engineer at ALE Lastra during 4 years and was involved in landmark projects such as the Bridge Pavilion in Zaragoza by Zaha Hadid, and many other bridge launching jobs, among other heavylifting projects. Later on and still with ALE Lastra, he oriented his career into a commercial role focused on the civil market. In 2014 he joined Mammoet, being first Account Manager and afterwards and for the last couple of years, Manager of the Spanish Branch. In 2020, after the acquisition of ALE by Mammoet, Rafael met up again with his former ALE Lastra colleagues where developed many of his skills in civil heavylifting. Currently he is responsible for civil market commercial activities within Mammoet.

 


 

IABSE Discussion: Pure tension! Two bridges in the heart of the new A5 motorway north of Vienna

 

Speaker: DI Dr. Michael Kleiser, ASFINAG Baumanagement GmbH

Date: 17 December 2020, 14-15.00 Hrs CET

Organised by: IABSE Austrian Group.

 

Abstract: At the end of 2017, ASFINAG erected two new bridges in the immediate vicinity of the north part of Vienna, which generated tension in different ways. The “Satzengrabenbrücke” is designed as an integral structure and contains new, maintenance-free roadway crossings, consisting of precast concrete elements placed next to one another that distributes the temperature-related displacements evenly over the asphalt above. This way, the stresses in the asphalt are limited to a tolerable level so that it remains free of cracks. Furthermore, the overpass bridge “A5.Ü20”, as an inclined post construction, triggers tension in the psychological sense of perception. A dynamic play of shapes with inclines and curvatures, which visually underpin the force transfer of the bridge, increases the overall expression and, thus, sets an accent in the middle of the new A5 north / Weinviertel motorway.

 

Spannung Pur! - Zwei Brücken im Herz der neuen A5 nördlich von Wien

DI Dr. Michael Kleiser, ASFINAG Baumanagement GmbH

 

Kurzfassung: Die ASFINAG errichtete Ende 2017 zwei neue Brücken in unmittelbarer Nachbarschaft im Norden Wiens, die in unterschiedlicher Weise Spannungen erzeugen. Die als integrales Tragwerk konzipierte Satzengrabenbrücke beinhaltet neuartige, wartungsfreie Fahrbahnübergänge, die die temperaturbedingten Verschiebungen durch aneinander gereihte Betonfertigteile gleichmäßig auf den darüber liegenden Asphalt verteilen. Dadurch werden die Spannungen im Asphalt auf ein erträgliches Maß begrenzt, sodass dieser rissefrei bleibt. Des Weiteren löst die Überführungsbrücke A5.Ü20 als Schrägstielkonstruktion Spannung im wahrnehmungspsychologischen Sinn aus. Durch ein dynamisches Formspiel mit Schrägen und Krümmungen, die die Kraftabtragung der Brücke visuell untermauern, wird der Gesamtausdruck gesteigert und somit ein Akzent in der Mitte der Neubaustrecke A5 Nord/Weinviertler Autobahn gesetzt.